Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/70r17 vs 245/70r17 Tire Comparison Side By Side
  235/70-17 245/70-17 Difference
Diameter inches (mm) 29.95 (760.8) 30.5 (774.8) 0.55 (14) 1.8%
Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%
Circum. inches (mm) 94.1 (2390.12) 95.83 (2434.11) 1.73 (43.98) 1.8%
Sidewall Height inches (mm) 6.48 (164.5) 6.75 (171.5) 0.28 (7) 4.3%
Revolutions per mile (km) 673.33 (418.39) 661.16 (410.83) -12.17 (-7.56) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.37 mph (32.78 km/h)
25 mph (40.23 km/h)25.46 mph (40.97 km/h)
30 mph (48.28 km/h)30.55 mph (49.17 km/h)
35 mph (56.33 km/h)35.64 mph (57.36 km/h)
40 mph (64.37 km/h)40.74 mph (65.56 km/h)
45 mph (72.42 km/h)45.83 mph (73.75 km/h)
50 mph (80.47 km/h)50.92 mph (81.95 km/h)
55 mph (88.51 km/h)56.01 mph (90.14 km/h)
60 mph (96.56 km/h)61.1 mph (98.34 km/h)
65 mph (104.61 km/h)66.2 mph (106.53 km/h)
70 mph (112.65 km/h)71.29 mph (114.73 km/h)
75 mph (120.7 km/h)76.38 mph (122.92 km/h)
80 mph (128.75 km/h)81.47 mph (131.12 km/h)
85 mph (136.79 km/h)86.56 mph (139.31 km/h)
90 mph (144.84 km/h)91.66 mph (147.51 km/h)
95 mph (152.89 km/h)96.75 mph (155.7 km/h)
100 mph (160.93 km/h)101.84 mph (163.9 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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